static gboolean
parse_ref_summary (const char *contents,
GHashTable **out_refs,
GError **error)
{
gboolean ret = FALSE;
gs_unref_hashtable GHashTable *ret_refs = NULL;
char **lines = NULL;
char **iter = NULL;
char *ref = NULL;
char *sha256 = NULL;
ret_refs = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
lines = g_strsplit_set (contents, "\n", -1);
for (iter = lines; *iter; iter++)
{
const char *line = *iter;
const char *spc;
if (!*line)
continue;
spc = strchr (line, ' ');
if (!spc)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Invalid ref summary file; missing ' ' in line");
goto out;
}
g_free (ref);
ref = g_strdup (spc + 1);
if (!ostree_validate_rev (ref, error))
goto out;
g_free (sha256);
sha256 = g_strndup (line, spc - line);
if (!ostree_validate_checksum_string (sha256, error))
goto out;
g_hash_table_replace (ret_refs, ref, sha256);
/* Transfer ownership */
ref = NULL;
sha256 = NULL;
}
ret = TRUE;
ot_transfer_out_value (out_refs, &ret_refs);
out:
g_strfreev (lines);
return ret;
}
/* TODO: Add a man page. */
gboolean
ostree_builtin_create_usb (int argc,
char **argv,
OstreeCommandInvocation *invocation,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GOptionContext) context = NULL;
g_autoptr(OstreeAsyncProgress) progress = NULL;
g_auto(GLnxConsoleRef) console = { 0, };
context = g_option_context_new ("MOUNT-PATH COLLECTION-ID REF [COLLECTION-ID REF...]");
/* Parse options. */
g_autoptr(OstreeRepo) src_repo = NULL;
if (!ostree_option_context_parse (context, options, &argc, &argv, invocation, &src_repo, cancellable, error))
return FALSE;
if (argc < 2)
{
ot_util_usage_error (context, "A MOUNT-PATH must be specified", error);
return FALSE;
}
if (argc < 4)
{
ot_util_usage_error (context, "At least one COLLECTION-ID REF pair must be specified", error);
return FALSE;
}
if (argc % 2 == 1)
{
ot_util_usage_error (context, "Only complete COLLECTION-ID REF pairs may be specified", error);
return FALSE;
}
/* Open the USB stick, which must exist. Allow automounting and following symlinks. */
const char *mount_root_path = argv[1];
struct stat mount_root_stbuf;
glnx_autofd int mount_root_dfd = -1;
if (!glnx_opendirat (AT_FDCWD, mount_root_path, TRUE, &mount_root_dfd, error))
return FALSE;
if (!glnx_fstat (mount_root_dfd, &mount_root_stbuf, error))
return FALSE;
/* Read in the refs to add to the USB stick. */
g_autoptr(GPtrArray) refs = g_ptr_array_new_full (argc, (GDestroyNotify) ostree_collection_ref_free);
for (gsize i = 2; i < argc; i += 2)
{
if (!ostree_validate_collection_id (argv[i], error) ||
!ostree_validate_rev (argv[i + 1], error))
return FALSE;
g_ptr_array_add (refs, ostree_collection_ref_new (argv[i], argv[i + 1]));
}
/* Open the destination repository on the USB stick or create it if it doesn’t exist.
* Check it’s below @mount_root_path, and that it’s not the same as the source
* repository.
*
* If the destination file system supports xattrs (for example, ext4), we use
* a BARE_USER repository; if it doesn’t (for example, FAT), we use ARCHIVE.
* In either case, we want a lossless repository. */
const char *dest_repo_path = (opt_destination_repo != NULL) ? opt_destination_repo : ".ostree/repo";
if (!glnx_shutil_mkdir_p_at (mount_root_dfd, dest_repo_path, 0755, cancellable, error))
return FALSE;
OstreeRepoMode mode = OSTREE_REPO_MODE_BARE_USER;
if (TEMP_FAILURE_RETRY (fgetxattr (mount_root_dfd, "user.test", NULL, 0)) < 0 &&
(errno == ENOTSUP || errno == EOPNOTSUPP))
mode = OSTREE_REPO_MODE_ARCHIVE;
g_debug ("%s: Creating repository in mode %u", G_STRFUNC, mode);
g_autoptr(OstreeRepo) dest_repo = ostree_repo_create_at (mount_root_dfd, dest_repo_path,
mode, NULL, cancellable, error);
if (dest_repo == NULL)
return FALSE;
struct stat dest_repo_stbuf;
if (!glnx_fstat (ostree_repo_get_dfd (dest_repo), &dest_repo_stbuf, error))
return FALSE;
if (dest_repo_stbuf.st_dev != mount_root_stbuf.st_dev)
{
ot_util_usage_error (context, "--destination-repo must be a descendent of MOUNT-PATH", error);
return FALSE;
}
if (ostree_repo_equal (src_repo, dest_repo))
{
ot_util_usage_error (context, "--destination-repo must not be the source repository", error);
return FALSE;
}
if (!ostree_ensure_repo_writable (dest_repo, error))
return FALSE;
if (opt_disable_fsync)
ostree_repo_set_disable_fsync (dest_repo, TRUE);
/* Copy across all of the collection–refs to the destination repo. */
GVariantBuilder refs_builder;
g_variant_builder_init (&refs_builder, G_VARIANT_TYPE ("a(sss)"));
for (gsize i = 0; i < refs->len; i++)
{
const OstreeCollectionRef *ref = g_ptr_array_index (refs, i);
g_variant_builder_add (&refs_builder, "(sss)",
ref->collection_id, ref->ref_name, "");
}
{
GVariantBuilder builder;
g_autoptr(GVariant) opts = NULL;
OstreeRepoPullFlags flags = OSTREE_REPO_PULL_FLAGS_MIRROR;
glnx_console_lock (&console);
if (console.is_tty)
progress = ostree_async_progress_new_and_connect (ostree_repo_pull_default_console_progress_changed, &console);
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}"));
g_variant_builder_add (&builder, "{s@v}", "collection-refs",
g_variant_new_variant (g_variant_builder_end (&refs_builder)));
g_variant_builder_add (&builder, "{s@v}", "flags",
g_variant_new_variant (g_variant_new_int32 (flags)));
g_variant_builder_add (&builder, "{s@v}", "depth",
g_variant_new_variant (g_variant_new_int32 (0)));
opts = g_variant_ref_sink (g_variant_builder_end (&builder));
g_autofree char *src_repo_uri = g_file_get_uri (ostree_repo_get_path (src_repo));
if (!ostree_repo_pull_with_options (dest_repo, src_repo_uri,
opts,
progress,
cancellable, error))
{
ostree_repo_abort_transaction (dest_repo, cancellable, NULL);
return FALSE;
}
if (progress != NULL)
ostree_async_progress_finish (progress);
}
/* Ensure a summary file is present to make it easier to look up commit checksums. */
/* FIXME: It should be possible to work without this, but find_remotes_cb() in
* ostree-repo-pull.c currently assumes a summary file (signed or unsigned) is
* present. */
struct stat stbuf;
if (!glnx_fstatat_allow_noent (ostree_repo_get_dfd (dest_repo), "summary", &stbuf, 0, error))
return FALSE;
if (errno == ENOENT &&
!ostree_repo_regenerate_summary (dest_repo, NULL, cancellable, error))
return FALSE;
/* Add the symlinks .ostree/repos.d/@symlink_name → @dest_repo_path, unless
* the @dest_repo_path is a well-known one like ostree/repo, in which case no
* symlink is necessary; #OstreeRepoFinderMount always looks there. */
if (!g_str_equal (dest_repo_path, "ostree/repo") &&
!g_str_equal (dest_repo_path, ".ostree/repo"))
{
if (!glnx_shutil_mkdir_p_at (mount_root_dfd, ".ostree/repos.d", 0755, cancellable, error))
return FALSE;
/* Find a unique name for the symlink. If a symlink already targets
* @dest_repo_path, use that and don’t create a new one. */
GLnxDirFdIterator repos_iter;
gboolean need_symlink = TRUE;
if (!glnx_dirfd_iterator_init_at (mount_root_dfd, ".ostree/repos.d", TRUE, &repos_iter, error))
return FALSE;
while (TRUE)
{
struct dirent *repo_dent;
if (!glnx_dirfd_iterator_next_dent (&repos_iter, &repo_dent, cancellable, error))
return FALSE;
if (repo_dent == NULL)
break;
/* Does the symlink already point to this repository? (Or is the
* repository itself present in repos.d?) We already guarantee that
* they’re on the same device. */
if (repo_dent->d_ino == dest_repo_stbuf.st_ino)
{
need_symlink = FALSE;
break;
}
}
/* If we need a symlink, find a unique name for it and create it. */
if (need_symlink)
{
/* Relative to .ostree/repos.d. */
g_autofree char *relative_dest_repo_path = g_build_filename ("..", "..", dest_repo_path, NULL);
guint i;
const guint max_attempts = 100;
for (i = 0; i < max_attempts; i++)
{
g_autofree char *symlink_path = g_strdup_printf (".ostree/repos.d/%02u-generated", i);
int ret = TEMP_FAILURE_RETRY (symlinkat (relative_dest_repo_path, mount_root_dfd, symlink_path));
if (ret < 0 && errno != EEXIST)
return glnx_throw_errno_prefix (error, "symlinkat(%s → %s)", symlink_path, relative_dest_repo_path);
else if (ret >= 0)
break;
}
if (i == max_attempts)
return glnx_throw (error, "Could not find an unused symlink name for the repository");
}
}
/* Report success to the user. */
g_autofree char *src_repo_path = g_file_get_path (ostree_repo_get_path (src_repo));
g_print ("Copied %u/%u refs successfully from ‘%s’ to ‘%s’ repository in ‘%s’.\n", refs->len, refs->len,
src_repo_path, dest_repo_path, mount_root_path);
return TRUE;
}
